Excellent finding Evert! Terrific.
So, this means that the JTAG is not actually Disabled, and, when Njepsen sets PORTC.3 as a UART he is actually manipulating the TMS pin for the JTAG interface. I'm surprised to see that it can still work as a UART.
Without knowing the results in MCUSR (Peek(0)), I would have expected the WatchDog Timer to reset the Micro?
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